Week 6-Meshing of Hood Challenge

objective:

to extract the 1.midsurface and 2. geometry cleanup and 3.meshing and 4.assigning thickness to the given inner hood component by giving mentioned quality criteria.

procedure:

• the given cad model is shown below.

1) extracting midsurface:

• the thickness of the given component is uniform.
• so i go with the skin offset option (geometry ---> midsurface ---> extraction options ---> skin offset )

• the below image shows after extraction of midsurface.

2) geometry cleanup:

• after creating midsurface we have to clean our geometry, that in the sense we have to clear the unwanted lines, surfaces to get the better result of our mesh.
• if we observe the we know that major part of the component is in symetric shape.
• so lets delete one part and create mesh and after we can make duplicate.
• this is just because of makeing easier to mesh the given component.

• i have selected the half symetric area to delete, by using delete option (f2).
• the following image is after deleted the symetric part.

• now lets make some geometry cleanup.by toggling some unwanted lines and minium distance lines.
• the following image shows that toggled unwanted lines and created missing surface.
• to visualize you i have kept in wire frame mode.

3) giving the quality criteria:

• the given quality parameters are as follow.
• element size is alredy mentioned as 5units.

• the given quality parameters must enter to the quality criteria in hypermesh window.
• in preferences we have criteria file settings as shown below.

• after opening file we can get criteria file. and after giving the quality parameters shown below.

4) meshing the model:

• we have taken element size is 5units & selected the mesh type as mixed.
• we use automesh, rebuild mesh, edit element, element cleanup,smooth,replce, quality index which are in 2D panel and tools like project,translate,edges which are in tool panel.
• 
• in automesh we need to get click on flow & map and link opposite edges with AR and by selecting the surface we can mesh the surface.
• better to go by part by part to get better result in mesh flow.
• in the above image we are meshing the difficult areas or curved shape parts
• we must mesh the model from inner to outer to eleminate the trias and to get the better result of mesh flow.
• 
• the below images are some which not following quality criteria and its below showing the corrected mesh.

damaged image:

corrected image:

one symetric part meshed image:

reflecting the mesh :

• here we have only one portion of the entire model to get the mesh of entire model we can reflect this mesh.
• the pathway to reflect the mesh is as follow,
• tools --> reflect --> select elements in the left bar --> select elements by displayed --> remove the non-symetric portion of the model by using subract from the selection option, which is below to the add to selection option. --> after that select y-axis in the right bar --> and to the base B we can select the edge point of the midsurface.
• then we get the reflction of mesh.
• the reflected mesh image is as follow;

checking the normals:

5) assigning thickness:-

• first create a material and property.
• asiagn steel matierial to the material component.
• in the thickness property details assaign the steel material and thickness T as 0.75mm.
• because, the thickness of the given model is 0.75mm.
• now, assaign this material and thickness properties to the middle surface.
• when we switch on the 2d traditional and detailed representation. we can see the thickness to the mesh.

conclussion:

with this we have completed the meshing the given hood model and assigned the thickness 0.75mm to the mesh.